The press conference for The Martian was hosted by Zhang Zhao, and Liu Zhou had originally not planned to attend.
However, to his surprise, what he thought would be a simple press conference attracted far more media than he had anticipated, and it was clear they were all there specifically for him.
Liu Zhou valued maintaining a good relationship with the media since the film's later promotion would depend on them, so he had no choice but to host the press conference in person.
Chapter 266